1
DATASHEET
To request the full datasheet, please visit www.intersil.com/products/isl91106
High Efficiency High Current Buck-Boost Regulator
with Bypass Mode
ISL91106, ISL91106A
The ISL91106 and ISL91106A are highly integrated buck-boost
switching regulators that accept input voltages either above or
below the regulated output voltage. Unlike other buck-boost
regulators, these regulators automatically transitions between
operating modes without significant output disturbance. The
devices also include a selectable bypass mode for low power
consumption in applications that have a sleep or low-power
mode.
These devices are capable of delivering up to 2A of output
current (PVIN = 2.8V, V
OUT
= 3.3V) and provide excellent
efficiency due to their fully synchronous 4-switch architecture. No
load quiescent current of only 45µA also optimizes efficiency
under light-load conditions.
The ISL91106 and ISL91106A are designed for stand-alone
applications. They support 3.3V and 3.4V fixed output voltages or
variable output voltages with an external resistor divider. Output
voltages as low as 1V or as high as 5.2V are supported using an
external resistor divider.
The ISL91106 and ISL91106A require only a single inductor and
very few external components. Power supply solution size is
minimized by a 2.15mmx1.51mm WLCSP and a 2.5MHz
switching frequency, which further reduces the size of external
components.
Related Literature
• AN1959, “ISL91106IIx-EVZ, ISL91106AIIx -EVZ Evaluation
Board User Guide”
Features
• ISL91106 with 3.8A switches
• ISL91106A with 4.2A switches
• Accepts input voltages above or below regulated output
voltage
• Automatic and seamless transitions between buck and boost
modes
• Input voltage range: 1.8V to 5.5V
• Output current (PVIN = 2.8V, V
OUT
= 3.3V):
-2.1A (ISL91106A)
- 2A (ISL91106)
• High efficiency: up to 96%
• 45µA quiescent current maximizes light load efficiency
• 2.5MHz switching frequency minimizes external component
size
• Selectable forced PWM mode
• Selectable bypass power saving mode
• Fully protected for over-temperature, overcurrent and
undervoltage
• Small 2.15mmx1.51mm WLCSP
Applications
• Smartphones and tablet PCs
• Wireless communication devices
• 2G/3G/4G power amplifiers
FIGURE 1. TYPICAL APPLICATION ISL91106IINZ, ISL91106IIQZ OR
ISL91106IIAZ, ISL91106AIIAZ
FIGURE 2. EFFICIENCY vs OUTPUT CURRENT (V
OUT
=3.3V)
VOUT
FB
C
2
2x22µF
PVIN
V
IN
=
1.8V to 5.5V
VIN
MODE1
MODE2
C
1
10µF
ISL91106IIN
,
ISL91106AIINZ
GND PGND
LX1
LX2
L
1
1µH
V
OUT
= 3.3V
MODE1 MODE2 MODE
00Disable
01Bypass
10EN, PWM
11EN, Auto
70
75
80
85
90
95
100
1 10 100 1000
V
IN
= 3.8V
V
IN
= 3.3V
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 2.5V
V
IN
= 4.2V
November 20, 2015
FN8679.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
| Copyright Intersil Americas LLC 2014, 2015. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
NOT RECOMMENDED FO
R NEW DESIGNS
RECOMMENDED REPLACEME
NT PART
ISL91107
